Hi all, just wondered if anyone has similar experience. I bought new iMac and even with fresh install I get this screen for a second just after waking up the machine. The machine has to be in sleep mode for at least a minute and I can reproduce this anytime upon waking it up. What do you think? Is this a "cosmetic" problem that does not need attention? I have gone to apple Genius bar, they wiped the machine and did a fresh install. One test and no problems, but when I got back home I did a retest and it came up... no other software had been installed. One important environmental condition is that the Display setting is Scaled and I clicked the left most box with "Larger Text" underneath. So this is only happening at this Scaled resolution, no other.